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If the area of the triangle formed by the first-order function y = x + B and the coordinate axis is 8, the analytic expression of the first-order function is______ ．
Let y = 0, the solution is: x = - B. let x = 0, the solution is: y = B. according to the area of the triangle surrounded by the primary function y = x + B and the coordinate axis is 8, we can get: 12|b|2 = 8. The solution is: B = ± 4. Then the analytic formula of the primary function is: y = x ± 4. So the answer is: y = x ± 4
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